JP2807332B2 - Wireless calling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention is capable of constantly checking that a receiver is within a range of a radio wave from a transmitter or has come out of the range. Related to wireless systems.

2. Description of the Related Art Wide area pagers are known as wireless paging systems. In this system, since the service area is specified by the telecommunications carrier, the person holding the receiver can easily identify whether he or she is in the service area or outside the service area. In addition, since the radio wave received by the receiver is usually a paging radio wave from the base station, the receiver is in a range where the paging radio wave intensity is equal to or higher than a level at which the paging radio wave can be decoded by the receiver. In such a case, if there is a call, the call radio wave can be received. Therefore, whether or not the user is in the service area can be determined only from the intensity of the received radio wave.

In a known private radio call system, one frequency is shared by many users, and one transmission time is limited to prevent monopolization of radio waves. Therefore, in this system, if the call signal strength is used as a guide for determining whether or not the call signal can be received, the same system as that of the own transmitter is used, although it is outside the range of the call signal from the own station transmitter. If you are within the range of the paging radio wave from the transmitter of the other station, you are out of the range of the paging radio wave from your own transmitter. There is a disadvantage that it is determined that you are inside.

There is also known a wireless paging system in which a receiver is carried when an operator of a vehicle-mounted wireless device leaves the vehicle, and the receiver is activated to notify a call when the wireless device receives a calling radio wave. In this system, the calling power is small and the antenna is only installed at a height of at most 1.5 m, so it is necessary to determine how far the radio wave can reach from the vehicle under various environmental conditions. There was a problem that we could not know. For this reason, it is necessary to overlook the fact that a call is being received or to return to the vehicle one by one to check for a call.

(Problem to be Solved by the Invention) The present invention has been made to solve such a problem, and a radio which always displays on a receiver whether or not a radio wave from a transmitter is within a reachable range. It is intended to provide a calling system.

(Means for Solving the Problems) In order to achieve the above object, a radio paging system of the present invention transmits a combination of a call signal and a partner station identification number at the time of a call, and transmits the call signal irrespective of the call. A transmitter that transmits the arrival distance confirmation signal and the partner station identification number in combination at a time interval of 1, and receives a radio wave from the transmitter, and transmits the reception station identification number, the call signal, and the arrival distance confirmation signal A call display circuit that is activated by the call signal when the partner station identification number and the own station identification number match, and wherein the reach distance confirmation signal is the first time. A reach that can be signaled that an interval has been received and that it has not been received over a second time interval longer than the first time interval Comprising a a receiver and a sure display circuit.

(Operation) The transmitter transmits a signal combining the calling signal and the partner station identification number at the time of calling, and transmits a signal combining the reach distance confirmation signal and the partner station identification number at the first time interval.

The receiver extracts the partner station identification number, the calling signal, and the reach distance confirmation signal, and when the retrieved partner station identification number matches the own station identification number, the call display circuit uses the call signal to confirm the reach distance. The reach distance confirmation display circuit is activated by the signal, and it is notified that the reach distance confirmation signal is not received over a second time interval longer than the first time interval.

(Embodiment) Hereinafter, an embodiment of the wireless calling system according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a transmitter in the radio paging system, and FIG. 2 is a block diagram showing a configuration of a receiver in the radio paging system.

In the transmitter 100 shown in FIG. 1, a call switch 110 operated at the time of calling is connected to a call control circuit 120 including a call signal generating circuit. The output of the call control circuit 120 and the output of the partner station identification number storage circuit 130 that stores the identification number of the partner station to be called are encoder 140
And the output of the encoder 140 is connected to the input of the transmitting circuit 150. The other input of the encoder 140 is connected to the output of the reach distance confirmation signal generation circuit 160.

Next, in the receiver 200 shown in FIG. 2, the output of the receiving circuit 210 for receiving and detecting the calling radio wave is connected to one input of the decoder 220, and the first output of the decoder 220 is connected to one input of the comparing circuit 230. Connected to. The other input of the comparison circuit 230 is connected to the own station identification number storage circuit 240 for storing the own station identification number. The second output of the decoder 220 is connected to the call display circuit 250 via a gate controlled by the output of the comparison circuit 230, and the third output of the decoder 220 is connected to the gate controlled by the output of the comparison circuit 230. Is connected to the reach distance identification display circuit 260 via

Next, the operation of the wireless calling system according to this embodiment will be described with reference to FIGS. When making a call, first, the call switch 110 is operated. The operation of the call switch 110 is performed by the call control circuit 120.
And activates a ringing signal generation circuit therein to supply a ringing signal to the encoder 140. Therefore, the encoder 140 reads out the identification number of the partner station from the partner station identification number storage circuit 130, encodes the identification number of the partner station and the call signal to generate a first encoded signal, and sends this to the transmission circuit 150. Supply and send.

The reach distance confirmation signal generation circuit 160 generates a reach distance confirmation signal at regular time intervals and supplies it to the encoder 140 even when a call is not made. So encoder 1
The reference numeral 40 encodes the reach distance confirmation signal and the identification number of the other station to produce a second encoded signal, which is supplied to the transmitting circuit 150 for transmission.

If the occurrence of the calling signal and the arrival distance confirmation signal overlap, the calling is prioritized.

On the other hand, in the receiver 200, a paging radio wave from the transmitter 100 is detected by a receiving circuit 210 to extract a first encoded signal or a second encoded signal, and these encoded signals are decoded.
Give to 220. Therefore, the decoder 220 decodes these coded signals, first takes out the identification number of the partner station, and
Give to 230. The comparison circuit 230 compares the given identification number of the partner station with the identification number of the own station from the own station identification number storage circuit 230.

As a result of the comparison, if the two identification numbers do not match, the user is not called, and no further operation is performed. If the two identification numbers match, the comparison circuit 230 generates an output and opens the gate. Therefore, when the first coded signal is being received, the call signal is taken out and the call display circuit 240 is activated to notify the call by sound, light, etc., and the second coded signal is received. When it is, the reach distance confirmation signal is taken out and the reach distance confirmation display circuit
When 250 is activated, the fact that the receiver 200 is within the range of the radio wave from the transmitter 100 is indicated by sound, light, or the like.

Further, even when the reach distance confirmation signal has not been received for a predetermined time or more, the reach distance confirmation display circuit 250 operates to notify that the receiver 200 is out of the radio wave reach distance range of the transmitter 100.

Although the above description is for a one-to-one call, the present invention can also be applied to a one-to-many call system such as a private pager. At this time,
A plurality of identification numbers may be stored in the identification number storage circuit 130, and a selection switch for selecting a plurality of call partners may be used instead of the call switch 110. In addition, it is also possible to operate the call control circuit 120 by the output of a wireless device with a calling function or an output of the wireless device anti-theft device, and to provide a wireless calling system in which the operator carries the receiver 200.

(Effect of the Invention) As will be understood from the above description of the present invention in detail with reference to the embodiments, the transmitter transmits the identification number of the partner station and the reach distance confirmation signal, and the receiver transmits the identification number. Since it is always determined whether or not the identification number and the reach distance confirmation signal are received, it is possible to reliably recognize whether the user is within or outside the range of the radio wave from the own station transmitter, The reliability of the wireless paging system can be improved.

Also, when an error occurs in the transmitter or receiver,
As long as it is within the range of the radio wave from the transmitter, it is immediately noticed that the range confirmation signal cannot be received, so that the occurrence of an abnormality can be promptly dealt with.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transmitter used in one embodiment of the radio paging system according to the present invention, and FIG. 2 is a block diagram of a receiver used in one embodiment of the radio paging system according to the present invention. FIG. 3 is a block diagram illustrating a configuration. 110: paging switch, 120: paging control circuit, 130: partner station identification number storage circuit, 140: encoder, 150: transmission circuit, 160: reachable distance confirmation signal generation circuit, 210: reception circuit, 22
0: decoder, 230: own station identification number storage circuit, 240: call display circuit, 250: reach distance identification display circuit.

Claims (3)

(57) [Claims] When a call is made, a combination of a call signal and a partner station identification number is transmitted, and at the first time interval, a reach distance confirmation signal and the partner station identification number are combined and transmitted regardless of the call. A transmitter, receiving radio waves from the transmitter, the partner station identification number,
A receiver capable of extracting the call signal and the reach distance confirmation signal, wherein a call display circuit activated by the call signal when the partner station identification number matches the own station identification number; A reception distance confirmation display circuit capable of notifying that a distance confirmation signal is received at the first time interval and not received over a second time interval longer than the first time interval. And a wireless paging system comprising: 2. A calling circuit which operates at the time of calling to generate a calling signal, a storage circuit which stores a partner station identification signal, an arrival distance confirmation signal generating circuit which generates an arrival distance confirmation signal at predetermined time intervals, The transmitter according to claim 1, further comprising: a transmission circuit that transmits a signal obtained by combining the call signal or the reach distance confirmation signal and the partner station identification signal. 3. A decoding circuit for receiving radio waves from the transmitter and extracting the counterpart station identification signal, the calling signal and the reachable distance confirmation signal, and the extracted counterpart station identification number and own station identification number. A comparison circuit that generates an output when both identification numbers match, a call display circuit activated by the call signal in response to an output of the comparison circuit, and a response circuit that responds to an output of the comparison circuit. 2. The receiver according to claim 1, further comprising: an arrival distance confirmation display circuit operated by the arrival distance confirmation signal.